Installation; Connection To Water Supply; Flue Connection; Chimney Connection - Rapido F 110 NT Manuel D'installation

7. Installation

Installation must be carried out by a qualified technician,
who takes responsibility both for installation and for putting
the unit into operation, as laid down in regulations.

7.1 Connection to water supply

The heating advance and back-flow connections are in the
end section in the upper and lower boiler hub axis exten-
sion. The water distribution pipe drain holes must be lined
up horizontally. A heating back-flow connection must be
pre-fitted to permit filling and draining of the boiler.
The safety valve should be installed in the heating advan-
ce, in the immediate vicinity of the boiler (valid for enclosed
units).

7.2 Flue connection

The flue pipe should be connected to the boiler flue gas
outlet in compliance with DIN 1298. Ensure that it is pro-
perly attached all around the flue gas outlet. The flue pipe
is further sealed by use of sealing strip, as in Fig. 4.
Fig. 4
end section
flue gas collector
flue pipe
sealing strip

Chimney connection

A chimney of adequate dimensions is vital for the correct
functioning of the burner unit.
Dimensions comply with DIN 4705, with reference to DIN
18160, and on the basis of boiler and burner capacity. For
sliding units, use chimneys corresponding to DIN 18160
part 1, group 1. The total exhaust gas flow for the collective
nominal heat capacity must be taken into account when
calculating dimensions. The effective chimney height is
measured from the burner level. In this respect, we draw
your attention to any local regulations that may apply.
Ensure that the flue gas temperature in the lower capacity
range of modular units does not drop below approx. 160° C
on entry into the chimney.
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Select a chimney construction that minimises the danger
of condensation or a cold chimney inner wall. For exact and
constant control of the chimney draught, we recommend
the installation of a draught limiter, which permits:
1. stabilisation of draught variations
2. virtual elimination of dampness inside chimney
3. reduced waste when system is off.
Connection pieces should be attached to the chimney with
an upward incline, in flow direction, of 30° or 45°. It is
advisable to fit flue pipes with heat insulation.

7.3 Checking seals

Fill the boiler and heating system with water and carry out
seal check. Do not exceed the maximum permitted total
pressure of 6 bar while doing so.

7.4 Burner connection

Fit burner to ready-drilled burner door following the manu-
facturer's instructions (see Fig. 5).
NB!
When fitting a blue-flame burner, the re-circulation
pipe must be removed (see chapter 9.5)
The burner tube should be fed downwards into the boiler at
an angle of 1.5° and should not stand proud of the inner
edge of the door brick, as this would partially block the
re-circulation pipe inlet holes.
The boiler fulfils the specifications laid down in 1.
BimSchV when used in conjunction with a regulation-
approved burner which is proven to maintain the follo -
wing values: 80 mg Nox/kWh with natural gas and 120
mg Nox/kWh with EL heating oil.
Fig. 5

7.5 Flue gas thermometer

The heating unit should be equipped with a flue gas
thermometer to permit control of flue gas temperature. The
higher the flue gas temperature, the higher the flue gas
waste. Increased flue temperatures lead to build-up of
deposits, which reduce the working efficiency of the unit. If
flue temperatures increase, have the heating unit cleaned
and readjusted by a qualified person.
The recommended flue gas temperature is approx. 160° -
240°C.